1. The res is not so high (800x600 or less)
2. It sends out the analog signal directly to the output without conversion (A to D conversion is slow if you want good quality)
Since digital camcorders have to do a A/D conversion (lower res than a DSLR), it might be possible to put this functionality on a DSLR if they cut a corner on #1 or #2. I.e. less resolution, or lower quality.
Just my $.02 worth
rg
John Francis wrote:
When I last posted that live preview caused an increase in shutter lag I had a few people who doubted this. Here is the design book ...
That just shows that some particular chip designs have this problem. It doesn't mean that it's an inherent problem if you use CCD sensors.
As I pointed out, CCD TV cameras work just fine, so it's obviously possible to have a live-preview CCD SLR which adds less than 1/60 of a second to the shutter lag - something you'd be hard put to detect.
There may be other reasons (cost, power, ...) not to incorporate this capability in a sensor designed to be used in a DSLR. But inasmuch as there are proofs-by-example that it's possible, your assertion that it can't be done seems to be on shaky ground
